$ git clone -n https://github.com/xcp-ng-rpms/gnutls.git /var/lib/mock/v8.3-u-pcoval2-10087-28708/root/chroot_tmpdir/scmroot/gnutls
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10087-28708/root/chroot_tmpdir/scmroot/gnutls'...
$ git fetch origin a532cee6bdbe9e2002b195dff5c1f80c3a8bee59:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/gnutls
 * [new ref]         a532cee6bdbe9e2002b195dff5c1f80c3a8bee59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a532cee bump release for test build